US4893803A - Method of and device for folding a sheet - Google Patents

Method of and device for folding a sheet Download PDF

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Publication number
US4893803A
US4893803A US07/003,735 US373587A US4893803A US 4893803 A US4893803 A US 4893803A US 373587 A US373587 A US 373587A US 4893803 A US4893803 A US 4893803A
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US
United States
Prior art keywords
sheet
folding
guide means
cylinder
folding cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/003,735
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English (en)
Inventor
Heino Petersen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eltex Elektrostatik GmbH
Original Assignee
Eltex Elektrostatik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Assigned to ELTEX-ELEKTROSTATIK GESELLSCHAFT MBH reassignment ELTEX-ELEKTROSTATIK GESELLSCHAFT MBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PETERSEN, HEINO
Application granted granted Critical
Publication of US4893803A publication Critical patent/US4893803A/en
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Expired - Fee Related legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/16—Rotary folders
    • B65H45/162—Rotary folders with folding jaw cylinders
    • B65H45/167—Rotary folders with folding jaw cylinders having associated sheet guide means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/28—Folding in combination with cutting

Definitions

  • the invention concerns a method of and a device for folding a sheet cut from an advancing web of material, transferred to a collecting cylinder, picked up in the vicinity of its midline by a folding cylinder that rests against the collecting cylinder in a nip along the midline of the sheet, and drawn completely over the folding cylinder while both halves of the sheet are folded together along the midline as the rotation continues, whereby the cylinders rotate in opposite directions and the web is charged at least outside the cylinders if necessary.
  • This method can be employed in rotogravure, flexographic, letterpress, or offset printing.
  • Folding devices that operate on this principle entail the risk, especially at high speeds, that what is called “lashing” in the vicinity of the collecting and folding-knife cylinder, which will be briefly termed the “collecting cylinder” hereinafter, will produce dog-ears or tears at the rear edge of the copy, specifically at both the bottom and the top of the sheet, even during double folding.
  • Strip bonding is possible only to a limited extent in rotary flexographic, letterpress, and especially offset printing.
  • the object of the invention is to improve a method and device of the aforesaid genus in order to avoid lashing and hence increase throughput without dog-earing.
  • the top of the sheet is drawn toward a guide by electrostatic force and channeled and transferred by the guide to the folding cylinder without impact or flapping, allowing considerably higher speeds.
  • its rear can rest against a segment of the surface of the cylinder that is electrostatically recharged every time the cylinder rotates, causing its end as well to rest tight against the folding cylinder until it comes into contact with the top of the sheet, at which point the folding process is complete.
  • FIG. 1 is a perspective view of a device in accordance with the invention for carrying out the method in accordance with the invention
  • FIG. 2 is a schematic front view of the device illustrated in FIG. 1, and
  • FIG. 3 is a cross-section through the guide illustrated in FIGS. 1 and 2.
  • the folding device labeled 5 overall in FIG. 1, has a collecting and folding-knife cylinder 6 with a web 7 traveling onto its surface. Web 7 is separated into sheets of a very specific length by an unillustrated guillotine accommodated in a block 8 and secured by points once the downstream briefly termed collecting cylinder has rotated one unit farther in the direction indicated by arrow 9.
  • a folding cylinder 12 parallels and rests against collecting cylinder 6, rotating in the opposite direction.
  • the beams can also move back and forth, allowing the position of guide 13' to be precisely established.
  • Guide 13' is essentially S-shaped in the illustrated embodiment. It has, as will be evident from FIG. 3, a midsection 18 that can be electrostatically charged and an electrically non-conductive section 19 on each side of the midsection. The midsection is connected to a source of electrostatic voltage.
  • collecting cylinder 6 is equipped with a projecting folding knife 20 and folding cylinder 12 with a flap 21 that operates in conjunction with the knife.
  • a separated sheet 22 is forced along a line in the vicinity of its middle into flap 21 by folding knife 20 for the purpose of being folded.
  • the the bottom 23 of sheet 22 is advanced toward folding cylinder 12 in the direction indicated by arrow 9 by collecting cylinder 6, whereas the top of the sheet is drawn onto collecting cylinder 6 opposite the direction indicated by arrow 9, which would result in lashing except that the latter is practically eliminated by the positioning of guide 13' and its connection to a source of electrostatic high voltage.
  • Folding cylinder 12 also has a segment 25 in its surface to secure the rear of the bottom 23 of sheet 22 and consisting of an electrostatically chargeable insulator, which also helps to prevent lashing.
  • An electrode 26 is also positioned upstream of nip 13 in the direction of rotation, electrostatically recharging segment 25 at every rotation.
  • the guide 13' can have a variety of shapes, and the central section of this guide may be made of sheet metal.
  • the electrically non-conductive section may be in the form of a coating of lacquer.
  • the outside of the web 7 may have a charging electrode of predetermined polarity.
  • Another electrode 26 of opposite polarity may be provided for the folding cylinder 12 and the guide 13'.
  • a source of negative high voltage may be connected to the electrode 26 of opposite polarity for the folding cylinder and the guide.

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  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
US07/003,735 1986-01-21 1987-01-16 Method of and device for folding a sheet Expired - Fee Related US4893803A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863601660 DE3601660A1 (de) 1986-01-21 1986-01-21 Verfahren und vorrichtung zum falzen von aus einer fortlaufenden materialbahn abgeschnittenen bogen

Publications (1)

Publication Number Publication Date
US4893803A true US4893803A (en) 1990-01-16

Family

ID=6292295

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/003,735 Expired - Fee Related US4893803A (en) 1986-01-21 1987-01-16 Method of and device for folding a sheet

Country Status (5)

Country Link
US (1) US4893803A (de)
EP (1) EP0230305A3 (de)
JP (1) JPS62191376A (de)
DE (1) DE3601660A1 (de)
SU (1) SU1521277A3 (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5013020A (en) * 1988-07-20 1991-05-07 Heidelberger Druckmaschinen Ag Apparatus to guide copy segments in the folder of rotary printing presses
US5064180A (en) * 1990-04-09 1991-11-12 Harris Graphics Corporation Electrostatic diverter
US5226871A (en) * 1991-07-03 1993-07-13 Rockwell International Corporation Folder with gradual guide assembly and method
US5547452A (en) * 1993-12-09 1996-08-20 Albert Frankenthal Aktiengesellschaft Method and apparatus for cross-folding signatures
US20030069118A1 (en) * 2001-10-05 2003-04-10 Trovinger Steven W. Sheet folding apparatus with rounded fold blade
US6673002B2 (en) 2001-10-05 2004-01-06 Hewlett-Packard Development Company, L.P. Sheet folding apparatus with pivot arm fold rollers
US20040048728A1 (en) * 2001-10-05 2004-03-11 Trovinger Steven W. Sheet folding apparatus
US6808479B2 (en) 2001-10-05 2004-10-26 Hewlett-Packard Development Company, L.P. Thick media folding method
US6837841B2 (en) 2002-09-30 2005-01-04 Hewlett-Packard Development Company, L.P. Method and apparatus for sheet folding
US6878104B2 (en) 2001-10-05 2005-04-12 Hewlett-Packard Development Company, L.P. Variable media thickness folding method
WO2005077800A1 (en) * 2004-02-11 2005-08-25 Fabio Perini S.P.A. Folding machine for folding a continuous web material and relative folding method
US20060150841A1 (en) * 2005-01-07 2006-07-13 Heidelberger Druckmaschinen Ag Printing press

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234307A1 (de) * 1992-10-12 1994-04-14 Heidelberger Druckmasch Ag Einrichtung zur störungsfreien Produktförderung in Falzapparaten
DE19716325C2 (de) 1997-04-18 2001-04-26 Koenig & Bauer Ag Vorrichtung zum elektrostatischen Aufladen eines mehrlagigen Stranges
DE19755745C2 (de) * 1997-12-16 2002-05-08 Koenig & Bauer Ag Einrichtung zum elektrostatischen Beeinflussen von Signaturen
US6605027B1 (en) * 2000-11-16 2003-08-12 Heidelberger Druckmaschinen Ag Fold-off guide for a folder in a paper-processing machine
ITMI20051482A1 (it) * 2005-07-29 2007-01-30 Officine G Cerutti S P A Dispositivo per condurre delle segnature tra due cilindri di una piegatrice

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB364709A (en) * 1930-10-20 1932-01-14 Benjamin James Hall Apparatus for separating sheets of paper or other material whilst travelling in the same direction
US3323794A (en) * 1965-04-05 1967-06-06 Harris Intertype Corp Sheet handling apparatus
US3346253A (en) * 1965-03-31 1967-10-10 Frank R Paschke Electrostatic sheet control means
US3351340A (en) * 1964-06-30 1967-11-07 American Photocopy Equip Co Document transport for photocopy machine
DE2142902A1 (de) * 1971-08-27 1973-03-08 Dornier Ag Vorrichtung zum schneiden, sammeln und falzen einer oder mehrerer ankommender papierbahnen
DE2634108A1 (de) * 1976-07-29 1978-02-02 Koenig & Bauer Ag Raederfalzapparat
GB2067523A (en) * 1980-01-18 1981-07-30 Computer Instrumentation Ltd Holding sheet material on to a drum
US4494949A (en) * 1983-01-10 1985-01-22 The Lehigh Press, Inc. Sheet folding apparatus and method
US4666139A (en) * 1985-10-21 1987-05-19 Harris Graphics Corporation Vacuum system for combination fold-off control

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1513575A (en) * 1921-07-13 1924-10-28 Cottrell C B & Sons Co Folding mechanism
US3362705A (en) * 1965-11-22 1968-01-09 Harris Intertype Corp Method and apparatus for folding sheet material
SE382943B (sv) * 1974-09-12 1976-02-23 Wifag Maschf Falsapparat
DE3030775C2 (de) * 1980-08-14 1993-04-15 Albert-Frankenthal Ag, 6710 Frankenthal Falzapparat
DE8133998U1 (de) * 1981-11-21 1983-12-01 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Falzapparat
DE3321577A1 (de) * 1983-06-15 1984-12-20 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Bremsbuersten im falzapparat von rotationsdruckmaschinen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB364709A (en) * 1930-10-20 1932-01-14 Benjamin James Hall Apparatus for separating sheets of paper or other material whilst travelling in the same direction
US3351340A (en) * 1964-06-30 1967-11-07 American Photocopy Equip Co Document transport for photocopy machine
US3346253A (en) * 1965-03-31 1967-10-10 Frank R Paschke Electrostatic sheet control means
US3323794A (en) * 1965-04-05 1967-06-06 Harris Intertype Corp Sheet handling apparatus
DE2142902A1 (de) * 1971-08-27 1973-03-08 Dornier Ag Vorrichtung zum schneiden, sammeln und falzen einer oder mehrerer ankommender papierbahnen
DE2634108A1 (de) * 1976-07-29 1978-02-02 Koenig & Bauer Ag Raederfalzapparat
GB2067523A (en) * 1980-01-18 1981-07-30 Computer Instrumentation Ltd Holding sheet material on to a drum
US4494949A (en) * 1983-01-10 1985-01-22 The Lehigh Press, Inc. Sheet folding apparatus and method
US4666139A (en) * 1985-10-21 1987-05-19 Harris Graphics Corporation Vacuum system for combination fold-off control

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5013020A (en) * 1988-07-20 1991-05-07 Heidelberger Druckmaschinen Ag Apparatus to guide copy segments in the folder of rotary printing presses
US5064180A (en) * 1990-04-09 1991-11-12 Harris Graphics Corporation Electrostatic diverter
US5226871A (en) * 1991-07-03 1993-07-13 Rockwell International Corporation Folder with gradual guide assembly and method
US5547452A (en) * 1993-12-09 1996-08-20 Albert Frankenthal Aktiengesellschaft Method and apparatus for cross-folding signatures
US20040048728A1 (en) * 2001-10-05 2004-03-11 Trovinger Steven W. Sheet folding apparatus
US6673002B2 (en) 2001-10-05 2004-01-06 Hewlett-Packard Development Company, L.P. Sheet folding apparatus with pivot arm fold rollers
US20030069118A1 (en) * 2001-10-05 2003-04-10 Trovinger Steven W. Sheet folding apparatus with rounded fold blade
US6808479B2 (en) 2001-10-05 2004-10-26 Hewlett-Packard Development Company, L.P. Thick media folding method
US6855101B2 (en) 2001-10-05 2005-02-15 Hewlett-Packard Development Company, L.P. Sheet folding apparatus
US6878104B2 (en) 2001-10-05 2005-04-12 Hewlett-Packard Development Company, L.P. Variable media thickness folding method
US6939284B2 (en) 2001-10-05 2005-09-06 Hewlett-Packard Development Company, L.P. Sheet folding apparatus with rounded fold blade
US6837841B2 (en) 2002-09-30 2005-01-04 Hewlett-Packard Development Company, L.P. Method and apparatus for sheet folding
WO2005077800A1 (en) * 2004-02-11 2005-08-25 Fabio Perini S.P.A. Folding machine for folding a continuous web material and relative folding method
US20070135287A1 (en) * 2004-02-11 2007-06-14 Fabio Perini S.P.A. Folding machine for folding continuous web material and relative folding method
US20060150841A1 (en) * 2005-01-07 2006-07-13 Heidelberger Druckmaschinen Ag Printing press

Also Published As

Publication number Publication date
EP0230305A2 (de) 1987-07-29
DE3601660A1 (de) 1987-07-23
EP0230305A3 (de) 1989-10-25
SU1521277A3 (ru) 1989-11-07
JPS62191376A (ja) 1987-08-21

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ELTEX-ELEKTROSTATIK GESELLSCHAFT MBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PETERSEN, HEINO;REEL/FRAME:005021/0754

Effective date: 19870114

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Expired due to failure to pay maintenance fee

Effective date: 19930116

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362